1.Ambient air temperature: -5℃~+40℃, the highest monthly mean temperature should not exceed +30℃;
2.Altitude for installing place should not exceed 1000m;
3.When the ambient air temperature is +40℃, the relative humidity should not exceed 50%, and it allows higher relative humidity under lower temperature. Max average humidity in the dampest month is 90%, meanwhile the lowest average temperature of this month is + 25℃, and condensation on the product surface caused by temperature change should be taken into consideration.